Improvement in grinding-mills



E. & A. H. NORDYKE.

Grinding Mill.

Patented Sept. 4, 1866.,

Win @66 as UNITED STATES PATENT OFFICE.

ELLIS NORDYKE AND ADDISON H. NORDYKE, OF RICHMOND, INDIANA.

IMPROVEMENT IN GRINDING-MILLS.

Specification forming part of Letters Patent No. 57,754, dated September4, 1866.

To al whom it may concern:

Be it known that we, ELLIs NoRDYKE and ADDISON H. NoRDYKE, of Richmond,Indiana, have invented certain new and useful Improvements in MetallicEyes for Millstones and we hereby declare that the following is a full,clear, and exact description of the same, reference being bad to theaccompanyingdraw ings, which form a part of this specification, and tothe letters of reference marked thereon.

In the drawings, Figure l is a perspective view of our improvement, andFig.2 is a vertical section of the same, showing its position in themillstone.

In Fig. 1, A is an inverted hollow cone, the lower end of which isprovided with projections or lugs B and B upon its outer surfaceopposite each other. These projections or lugs are of an oblong squareform opening into and forming a part of the cavity or hollow of the eye,and are arranged to receive the wings of the driver. These lugs orprojections are let into the millstones by means of gains or recessesout into the same for their reception, as shown in Fig. 2. The upperportion of the cone or eye is constructed with the straight or parallelsides.

In Fig. 2, O and 0 represent the vertical section of the millstone withthe eye in its proper position. D, Fig. 2, is a bearing situated in theupper portion of the eye and rigidly attached to the same and composedof an inverted arch or saddle, the lower surface of the center of whichis provided with a conical recess to receive the point of the spindlesupporting the millstone in its revolutions.

The inverted form of the arched bearing adds much to its strength,allowing the whole to be made much lighter, yet, at the same time,stronger, and permits a much more nicely adjustable balancing of thestone.

This arrangement, as will readily be observed, is intended for thatclass of burrs in which the silent feed, or feeding the grain to theburrs by means of atube, is employed. For burrs in which the shoe andshaker are used we construct the bearing D with a suitable opening wherethe recess is now shown provided with a collar or other suitable device,and by extending the upper portion of the driver through this saidopening we attach to it any of the ordinary devices for giving thereciprocating motion to the shoe, as shown in the dotted lines in Fig.2.

When the arms of the bearing D are straight across the hollow cone, orwhen they are inclined downward, adifficulty arises in the freedischarge of the wheat, as the velocity of the burr gives a centrifugalforce to the grains of wheat by which they lodge upon' these projectionsand choke the feed. We deem the upward inclination of these arms as ofthe greatest importance, as the grain then meets only a smooth surface,and is not interrupted in its free discharge, and actual experimentshave proved that from four to siX bushels an hour additional can beground upon the same burrs by the use of this device.

Having thus fully described our said improvement, what we claim as new,and desire to secure by Letters Patent, is-

The herein-described metallic eye for millstones when constructed andoperating as described.

ELLIS NORDYKE. A. H. NORDYKE.

Witnesses:

WM. T. DENNIS, A. J. BELL.

